I know it sounds wacky, but, if you are running bigger tyres and have the v6 auto, you should really look at getting your speedo recalibrated.
1- bigger tyres record a lower speed and distance, so if you travel 100 miles on your odometer, you have probably gone between 105 and 108 miles in actual fact, that will give you a false mpg for a start.
2- the speedo dosn't just tell you how fast you are going. The ECU in these things uses that info to make a whole bunch of calcuation for the engine and gearbox, things like fuel mix, spark timing, what gear to be in. When the info the ECU receives is different to that in the computers data table the ECU tries to make compensations to make the info match, but, it never will, because the speedo is out. You will use more fuel, have less power, and, the car will hunt around gears tring to get things to go right.
I run 245/75/16's in a MTR, and had heaps of issues, bad gear changes, auto constantly hunting around in the gears changing up and down at inappropiate times, torque coverter locking up at too low a speed, real bad milage, and a real loss in power. Had the speedo recalibrated to the correct setting for the tyres, WOW, power BACK, economy BACK, no more funny gear changes, like driving a new car.
This REALLY worked for my KJ. Couldn't be happier now.
_________________ SOME SAY
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And
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